Isolated thunderstorms developed over northern Wisconsin ahead of a weak surface trough.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRB wrote it up.
Isolated thunderstorms developed over northern Wisconsin ahead of a weak surface trough.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before the first event at Aug 9, 2:14 AM CST, 12 hours 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 314 AM CDT THU AUG 9 2007 .SHORT TERM...TODAY THROUGH FRIDAY. FORECAST FOCUS ON PRECIPITATION CHANCES TODAY AND THIS EVENING. CURRENT SHOWER ACTIVITY WILL NOT AMOUNT TO MUCH THIS MORNING AS IT MOVES THRU THE CWA. MOST OF THE ACTION WILL STAY TO THE SOUTH SO WILL GO WITH LOW POPS AND SCATTERED SHOWERS OR SPRINKLES THIS MORNING. DURING THE AFTERNOON HOURS A FEW HUNDRED J/KG OF CAPE BUILDS ACROSS THE REGION AS A WELL DEFINED VORT ACROSS NORTHERN MINNESOTA MAKES ITS WAY THRU UPPER MICHIGAN. THIS SHOULD RESULT IN DIURNALLY DRIVEN SHOWERS AND THUNDERSTORMS ACROSS THE NORTHERN PORTION OF THE CWA AS THE TAIL END OF THE VORT SWINGS THRU THAT PORTION OF THE AREA. THE SOUTHERN CWA WILL BE TOO FAR AWAY FROM THE VORT TO TAKE ADVANTAGE OF THE LIFT...SO WILL LEAVE THIS PART OF THE CWA DRY THIS AFTERNOON. THE DIURNALLY DRIVEN ACTIVITY WILL NOT LAST LONG INTO THE EVENING HOURS...ONLY AFFECTING THE EXTREME NORTHEASTERN CWA DURING THE EARLY EVENING HOURS. DRY AIR AND SUBSIDENCE WILL AGAIN PREVAIL ACROSS THE REGION FOR THE REST OF TONIGHT AND INTO FRIDAY AS CLOUDS DECREASE. MOS TEMPERATURES FAIRLY CLOSE THIS RUN SO WILL NOT DEVIATE MUCH FROM THE PREVIOUS FORECAST. .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY RIDGE REMAINS ACROSS THE GREAT LAKES REGION. LIKE THE LAST FEW NIGHTS...MODELS CONTINUE TO SHOW CONVECTION BREAKING OUT WEST OF WISCONSIN WITH RETURN FLOW...THEN PUSH RAIN INTO OUR FAR NORTHWEST BETWEEN 12Z-18Z SATURDAY MORNING. SINCE MODELS HAVE BEEN CONSISTENT WITH THIS TREND...HAVE ADDED A SMALL CHANCE FOR RAIN OVER THE FAR NORTHWEST. HIGHEST RAIN CHANCES WILL BE ACROSS VILAS AND ONEIDA COUNTIES. WRF/GFS CONSISTENT IN DIMINISHING ACTIVITY BY THE AFTERNOON. CONTINUED A SMALL CHANCE FOR RAIN DURING THE AFTERNOON DUE TO INSTABILITY AND THE POTENTIAL FOR ANY LINGERING BOUNDARIES THAT MAY TRIGGER THUNDERSTORM ACTIVITY. MID LEVEL LAPSE RATES STEEPEN AS THE DAY PROGRESSES. SATURDAY NIGHT WILL BE AN INTERESTING NIGHT. GFS CONTINUES TO SHOW THE REGION CAPPED AND REMAINING DRY WITH STORMS WELL NORTH OF THE STATE. THE WRF DEPICTED SOME SHOWER AND STORM ACTIVITY ACROSS THE AREA. WITH STEEP MID LEVEL LAPSE RATES AND WEAK UPPER LEVEL DISTURBANCES PASSING ACROSS THE STATE... THOUGHT IT WOULD BE PRUDENT TO KEEP A SMALL CHANCE FOR SHOWERS AND STORMS. FRONT WILL SLOWLY SLIDE SOUTH OF THE AREA SUNDAY AFTERNOON. DAY SHIFT MAY BE ABLE TO REMOVE THE MENTION OF PRECIPITATION OVER THE NORTH SUNDAY AFTERNOON. CANADIAN HIGH PRESSURE BUILDS INTO THE REGION SUNDAY NIGHT INTO MONDAY. SIGNIFICANT DIFFERENCES ARISE ON TUESDAY AS NEW 00Z GFS BRINGS PRECIPITATION BACK INTO THE AREA. LATER SHIFTS CAN WORK OUT THOSE DETAILS. AS FOR TEMPERATURES...DID RAISE MAX/MIN TEMPERATURES SATURDAY THROUGH SUNDAY. TEMPERATURES COULD GO EVEN HIGHER FOR MAX TEMPERATURES BOTH DAYS DEPENDING ON AMOUNT OF CLOUD COVER AND CONVECTION. && .AVIATION...VFR CIGS/VIS WILL PREVAIL ACROSS MUCH OF THE REGION TODAY AND TONIGHT. SCT MVFR CIGS VIS POSSIBLE ACROSS NORTH CENTRAL WISCONSIN THIS AFTERNOON AND EARLY THIS EVENING WITH SHOWERS AND THUNDERSTORMS. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && KURIMSKI/ECKBERG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 451 AM CDT THU AUG 9 2007 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-101245- VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE-LINCOLN-LANGLADE- MENOMINEE-NORTHERN OCONTO-DOOR-MARATHON-SHAWANO-WOOD-PORTAGE- WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO-CALUMET- MANITOWOC-SOUTHERN MARINETTE-SOUTHERN OCONTO- 451 AM CDT THU AUG 9 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH-CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE POSSIBLE ACROSS NORTH CENTRAL WISCONSIN THIS AFTERNOON...AND ACROSS PORTIONS OF NORTHEAST WISCONSIN EARLY THIS EVENING. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS ACROSS NORTH CENTRAL WISCONSIN SATURDAY...AND ACROSS THE REST OF THE REGION SATURDAY NIGHT AND SUNDAY. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. LMZ521-522-541>543-564-101245- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- THE ADJOINING WISCONSIN WATERS OF LAKE MICHIGAN OUT TO MID-LAKE- 451 AM CDT THU AUG 9 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WATERS OF CENTRAL AND SOUTHERN GREEN BAY...AND LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO SHEBOYGAN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA LATE THIS AFTERNOON AND EARLY THIS EVENING. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS ON SATURDAY NIGHT AND SUNDAY...BUT SEVERE WEATHER IS NOT ANTICIPATED. KURIMSKI/ECKBERG
The Marquette radar (KMQT), 190 km away, was scanning. The volume nearest the first event began at 20:26 UTC.
1 thunderstorm wind. Local standard time, as filed.
A thunderstorm over southwest Vilas County produced heavy rain and straight-line winds that blew down trees and power lines in the Lac du Flambeau area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2007Every state in 2007This day in weather historyWarnings in Wisconsin, August 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 53425.